58
Figure 28:
TROUBLESHOOTING
AC
Blower
vacuum switch
closed.
1. Check for defective
blower on relay or control
module.
Disconnect Blower plug fron Control Module. With heater
off, measure continuity across pins 1 and 2 of receptacle on
Control Module. If closed, control module relay is defective.
Replace control module. If OK, proceed to step 2.
2. Vacuum switch is
defective.
Replace blower vacuum switch.
AO
Blower
vacuum switch
open.
1. Check for faulty
vacuum switch tubing
Check tubing and replace if necessary. If OK, proceed to step
2.
2. Check for faulty
vacuum switch wiring or
connection.
Inspect vacuum switch wiring. Ensure wire harness terminals
are securely fastened to spade terminals on vacuum switch. If
OK, proceed to step 3.
3. Check for faulty blower
wiring or connection
Inspect blower wiring. Ensure plug on blower is securely
fastened to control module. If OK, proceed to step 4.
4. Check for defective
vacuum switch
Disconnect Blower
plug from Control Module. Measure
resistance across Blower windings. Winding resistance across
lead should be in the following range; Red-to-White: 4 to
5 ohms. If measured values vary substantially from these
values, Blower is defective. Replace. If OK, pr
oceed to step
5.
5. Check for defective
blower relay.
Disconnect Blower plug from Control Module. Place heater in
Pool or Spa Mode. Lower set point temperature to generate
call for heat. During pre-purge period, measure for 120VAC
across pins 1 and 2. If 120VAC is not present, control module
relay is defective. Replace control module. If OK, proceed to
step 6
6. Vacuum switch is
defective
Replace blower vacuum switch.
bO
Bypass
Operation
1. Check to see if Control
Module is in Bypass
Operation
This is normal display when heater is being controlled by a
remote thermostat. No service is required. If heater is not
being controlled by remote thermostat, change setting by using
the MODE key to put the heater into STANDBY. Press and
hold the DOWN key and then press and hold the MODE key.
Hold down both keys for 3 seconds until the indication ‘‘bO’’
is removed from the display.
For further assistance, please contact technical service at 908-282-4897 or visit
www.trane.com/poolcomfort.